- Machine Shop & Tool Repair Service, Ottawa
- Machinery, Supplies & Equipment - Business Production Related, Ottawa
- Machinery, Supplies & Equipment - Business Supplies Related, Ottawa
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ottawa
- Mail Delivery Service, Ottawa
- Mailing, Delivery & Courier Service, Ottawa
- Major Appliances, Ottawa - Household & Kitchen
- Management Consultants & Services, Ottawa
- Manicurists & Pedicurists, Ottawa
- Manufacturers Agents & Representatives, Ottawa
- Manufacturers Representative, Ottawa - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ottawa
- Manufacturing Products, Ottawa
- Marriage & Family Counselors, Ottawa
- Masonry Materials & Supplies, Ottawa
- Material Handling Equipment, Ottawa - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Supplies & Equipment, Ottawa
- Membership Sports & Recreation Clubs, Ottawa
- Men's Clothing Stores, Ottawa - Clothes & Accessories
- Mental Health Clinics, Ottawa - Treatment Centers
- Mental Health Specialists, Ottawa - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Ottawa - Kits, Homes, Steel Buildings, etc
- Metal Plating & Polishing, Ottawa
- Methodist Church, Ottawa
- Mexican Restaurants, Ottawa
- Mini & Self Storage, Ottawa
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- Mining, Ottawa
- Miscellaneous Government, Ottawa
- Miscellaneous Manufacturing, Ottawa
- Miscellaneous Personal Services, Ottawa
- Miscellaneous Photographers, Ottawa
- Miscellaneous Professional, Ottawa
- Mobile Home Contractors, Ottawa
- Mobile Home Improvements & Repairs, Ottawa
- Mobile Home Parks & Communities , Ottawa
- Monuments, Tombstones, Markers & Memorials, Ottawa
- Mortgage Bankers & Correspondents, Ottawa
- Motor Vehicle, Ottawa
- Motor Vehicle Rental & Leasing, Ottawa
- Motorcycle Parts, Accessories & Dealers, Ottawa
- Movie Theaters, Ottawa
- Moving Companies, Ottawa
- Moving Supplies & Equipment Rental, Ottawa
- Moving Truck Rental , Ottawa
- Muffler Shop & Exhaust Systems, Ottawa
- Music, Ottawa
- Music Lessons, Ottawa
- Music Lessons - Instrumental, Ottawa
- Musical Instruments & Equipment Stores, Ottawa
- Musical Instruments - Guitars, Ottawa
- Musical Instruments Repair, Sales & Service, Ottawa
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